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Détails bibliographiques
Auteur principal:	IGNACIO IZUZQUIZA
Format:	Artículo científico
Langue:	es
Publié:	Universitat de Barcelona 2006
Sujets:	Educación percepción cibernética observación autopoiesis Von Foerster
Accès en ligne:	https://www.redalyc.org/articulo.oa?id=324127625010
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CONSTRUCTIVISMO, CIBERNÉTICA Y TEORÍA DE LA OBSERVACIÓN. NOTAS PARA UNA PROPUESTA TEÓRICA IGNACIO IZUZQUIZA Educación percepción cibernética observación autopoiesis Von Foerster El artículo presenta los rasgos fundamentales del constructivismo epistémico contemporáneo, destacando el interés de semejante perspectiva en el análisis del proceso de conocimiento. Semejante análisis posee, obviamente, implicaciones notables en la concepción de una didáctica de las ciencias sociales. Tales implicaciones quedan resaltadas cuando se consideran las raíces cibernéticas del constructivismo epistémico y se propone un paralelismo entre el constructivismo y la teoría de la observación de Von Foerster y la teoría de los sistemas autopiéticos. 2006 artículo científico 1579-2617 https://www.redalyc.org/articulo.oa?id=324127625010 es http://www.redalyc.org/revista.oa?id=3241 Enseñanza de las Ciencias Sociales application/pdf Universitat de Barcelona Enseñanza de las Ciencias Sociales (España) Num.5

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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